CN112349336A - Memory testing device - Google Patents
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- CN112349336A CN112349336A CN201911310450.XA CN201911310450A CN112349336A CN 112349336 A CN112349336 A CN 112349336A CN 201911310450 A CN201911310450 A CN 201911310450A CN 112349336 A CN112349336 A CN 112349336A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/0766—Error or fault reporting or storing
- G06F11/0787—Storage of error reports, e.g. persistent data storage, storage using memory protection
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing
- G11C29/12—Built-in arrangements for testing, e.g. built-in self testing [BIST] or interconnection details
- G11C29/38—Response verification devices
- G11C29/42—Response verification devices using error correcting codes [ECC] or parity check
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/50—Marginal testing, e.g. race, voltage or current testing
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/50—Marginal testing, e.g. race, voltage or current testing
- G11C2029/5004—Voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention belongs to the field of digital integrated circuit testing, and particularly relates to a memory testing device. The test device includes: the device comprises a Memory Integrated Test Platform (MITP) and a Personal Computer (PC), wherein the MITP comprises a Spartan6 FPGA minimum system, a power supply distribution network (PDN), a serial port circuit, an LED circuit and a memory test interface circuit. The method can be used for the functional tests of full erasing of the FPGA configuration memory in a normal temperature environment, full programming, verification, serial-parallel configuration output of various data and the like, and the functional tests of full programming, chessboard or March verification and the like of Nand Flash with JEDEC standard in different working modes. The test efficiency of the chip can be effectively improved, and the test cost is reduced.
Description
Technical Field
The invention belongs to the field of digital integrated circuit testing, and particularly relates to a memory testing device.
Background
Circuit testing, particularly digital circuit testing, is a very important technology in the development, manufacture and use of circuits, including circuit boards and systems. Memory is an important component of digital circuits and memory testing is an important area of testing technology. Two important indicators of memory testing are the detectability for various types of faults, fault coverage, and the time required to complete the test.
Nonvolatile memories have the characteristic of retaining information even when power is lost, and are a popular field of memory families. flash memory, which is the most rapidly developed nonvolatile memory, has increasingly higher density and complexity, and more types of defects are likely to exist, which makes testing of an SOC chip and its embedded memory difficult. In order to solve the problems in flash testing, people propose to apply built-in self-test or test related performance by using embedded software and other test methods, and the like, so that good effects are obtained, but most of the methods are single and are not suitable for batch product testing.
The current military memory production test has the following defects:
1. the testing time of a single chip is increased by times along with the increase of the capacity, so that the testing time of a machine table is increased, and the testing cost is higher and higher. In the case of large demand, pre-screening will become the key to cost savings.
2. The current programmer in the market only supports basic operations such as one-time data erasing, programming, verifying and the like, does not have the integration capability of full coverage of multiple functions, multiple data, multiple modes and different algorithms, and does not have detailed operation process records. Therefore, the common programmer has low efficiency and low fault coverage rate in the production test process.
3. Under the condition of large demand, if a plurality of programmers are purchased, the matching cost is increased, and the cost is not reduced.
4. In the pre-screening process, a voltage bias test is sometimes required to improve the screening efficiency and the yield, but a common programmer does not support the operation, so that the screening efficiency is reduced, and the test cost is increased.
Disclosure of Invention
In view of the above, the present invention is directed to an efficient and low-cost test of integration capability of pre-screening, multi-functional, multi-data, multi-mode, and full coverage of different algorithms for memory testing.
To solve the above technical problem, the present invention provides a memory test apparatus, including: the memory integrated test platform MITP comprises a Spartan6 FPGA minimum system, a power distribution network PDN, a serial port circuit, an LED circuit and a memory test interface circuit, wherein the power distribution network PDN, the serial port circuit, the LED circuit and the memory test interface circuit are in bidirectional communication with the Spartan6 FPGA minimum system respectively; the memory chip to be tested is connected with the MITP through the memory test interface, and the MITP and the PC realize serial port communication through the serial port circuit; the Spartan6 FPGA minimum system is a minimum basic unit which can maintain normal work of the FPGA except a power supply, and comprises a clock circuit, a reset circuit and a configuration circuit, wherein the clock circuit provides a necessary working clock source for the FPGA, the reset circuit provides stable and reliable reset pulse output for the FPGA, and an MAX811 chip is adopted as a reset pulse output chip; the configuration circuit adopts an AS configuration mode and a JTAG boundary scanning interface for Debug debugging and program solidification programming.
The PC machine adopts a Windows 7sp 164 bit operating system; the clock circuit comprises two clock sources of 50MHz and 125MHz, and hardware change is reduced by designing an optional reference clock; the configuration circuit employs HWD32P AS an AS configuration chip.
The testing device also comprises a software part, wherein the software comprises memory monitoring software running in a PC (personal computer) and memory integration testing software running in the MITP; the memory monitoring software is realized by a first serial port communication module, an information processing module, a UI interaction module, a storage module and a display module; the first serial port communication module mainly realizes the transceiving of the serial port data frame of the memory integrated test software running in the MITP, sends the received data frame to the information processing module for analysis, and sends the data frame packaged by the information processing module to the MITP; the information processing module realizes the analysis and encapsulation of data frames and the arbitration of control information according to a serial port communication protocol, the UI interaction module mainly realizes a man-machine interaction function and timely responds to the control requirements of testers, the storage module finishes the storage of necessary information and generates log files for subsequent reference, and the display module finishes the real-time display of operation process information mainly through a software display window; the memory integration test software is realized through a second serial port communication module, a clock module, a reset module, an RAM cache module, a logic arbitration module and a measurement and control module; the second serial port communication module comprises a serial port receiving module, a serial port sending module, a baud rate generating module and a CRC (cyclic redundancy check) module; the second serial port communication module mainly realizes the analysis and encapsulation of data frames, wherein: the device comprises a serial port receiving module, a serial port sending module, a CRC checking module and a memory monitoring software, wherein the serial port receiving module is used for receiving and analyzing a data frame, the serial port sending module is used for packaging and sending the data frame, the serial port receiving module and the serial port sending module both complete the receiving and sending of data through a baud rate pulse generated by the baud rate generating module, 16-bit CRC checking is carried out on the data frame by adopting the CRC checking module respectively in the receiving and sending processes, and test data issued by the memory monitoring software is cached through the RAM caching module in the analyzing process of the serial port receiving module; the measurement and control module comprises a plurality of functional test modules, and each functional test module comprises an FIFO cache module; the logic arbitration module is used for selecting to start the measurement and control module and performing logic arbitration on a data packet sending sequence; the reset module adopts global asynchronous reset; the clock module, the RAM cache module and the FIFO cache module are designed by adopting Xilinx official IP cores.
Further, the arbitration of the information processing module for the control information specifically includes: when the verification fails, the current data packet is immediately abandoned and the operation is interrupted, when the verification passes, the equipment type, the error code, the running state code and the effective return address in the data frame are extracted, and the arbitration is completed according to the error code and the running state code; outputting and displaying the current running state through a display module, and storing running process information into a specified log file when the test is finished; the UI interaction module realizes effective start and stop of the test through a button control, the control button comprises serial port opening and closing buttons, a test starting button, a resetting button and an exiting button, the serial port opening and closing buttons are used for controlling the start and the closing of serial port equipment, the test starting button is used for starting a background service thread and starting a memory function test, and the resetting button and the exiting button are respectively used for resetting each module of the software and safely exiting program operation.
The information processing module is not only used for analyzing and packaging the serial port data frame, but also used for controlling the process when the software runs.
Furthermore, in order to eliminate burrs introduced by asynchronous reset, the reset module adopts the principle of asynchronous reset synchronous release to synchronize an external input reset pulse into internal logic through two FFs; and the logic arbitration module selectively starts a corresponding measurement and control module according to the equipment type and the operation code analyzed by the data frame, and controls the transmission sequence of the data packet according to the transmission enabling signal.
Furthermore, the device can realize the full erasing of the FPGA configuration memory in a normal temperature environment and the full programming, checking and serial-parallel configuration output function test of various data, and has the full programming, chessboard or March checking function test of JEDEC standard Nand Flash in different working modes.
Furthermore, an external direct-current voltage source is adopted to realize the voltage bias test of the memory and complete the pre-screening, so that the final test yield can be effectively improved.
Has the advantages that:
1. the device can be used for the functional tests of full erasing of the FPGA configuration memory in a normal temperature environment, full programming, checking, serial-parallel configuration output of various data and the like, and the functional tests of full programming, chessboard or March checking and the like of Nand Flash with JEDEC standard in different working modes. The test efficiency of the chip can be effectively improved, and the test cost is reduced.
2. The measurement and control software interface is simple and has a one-key automatic test function, so that a tester can conveniently perform screening test, and the error rate is reduced.
3. The measurement and control software has a log storage function, and is beneficial to an engineer to analyze the later test data.
4. The measurement and control software can support parallel tests of a plurality of test platforms on the same computer, and the utilization rate of equipment is improved.
5. In the offline test process of the FPGA configuration memory in the 1 based on the device, the voltage bias test of the FPGA configuration memory is realized by using an external direct-current voltage source, and the pre-screening is completed, so that the final test yield can be effectively improved.
Drawings
FIG. 1 is a system configuration diagram of a test apparatus according to the present invention
FIG. 2 is a block diagram of the MITP hardware architecture;
FIG. 3 is a functional block diagram of the software portion of the test apparatus of the present invention;
FIG. 4 is a memory integration test software logic function structure;
FIG. 5 is a diagram of FPGA logic top level signal distribution;
FIG. 6 is a memory monitoring software flow diagram;
FIG. 7 shows the flow of tests performed by the HWD1603 and HWD29F040 using the present apparatus;
FIG. 8 shows the flow of tests of HWD04S and HWD18V04 using the present apparatus.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the present invention provides a memory test apparatus, including: the memory integrates a test platform MITP and a PC. As shown in fig. 2, the memory integrated test platform MITP includes a Spartan6 FPGA minimal system, a power distribution network PDN, a serial port circuit, an LED circuit, and a memory test interface circuit, where the power distribution network PDN, the serial port circuit, the LED circuit, and the memory test interface circuit are in bidirectional communication with the Spartan6 FPGA minimal system respectively; the memory chip to be tested is connected with the MITP through the memory test interface, and the MITP and the PC realize serial port communication through the serial port circuit; the Spartan6 FPGA minimum system is a minimum basic unit which can maintain normal work of the FPGA except a power supply, and comprises a clock circuit, a reset circuit and a configuration circuit, wherein the clock circuit provides a necessary working clock source for the FPGA, the reset circuit provides stable and reliable reset pulse output for the FPGA, and an MAX811 chip is adopted as a reset pulse output chip; the configuration circuit adopts an AS configuration mode and a JTAG boundary scanning interface for Debug debugging and program solidification programming.
The PC machine adopts a Windows 7sp 164 bit operating system, and develops memory monitoring software based on an MFC framework by using Visual Studio2015 based on the operating system, and the software mainly realizes monitoring and log generation of the whole memory testing process. The clock circuit comprises two clock sources of 50MHz and 125MHz, and hardware change is reduced by designing an optional reference clock. The configuration circuit employs HWD32P AS an AS configuration chip.
In the MITP system, the power supply requirements are given in table 1. In view of the diversity of the MITP power supply requirements, the main power distribution network adopts a 5V power adapter to supply power and supplies power to the system through the LDO and the integrated power chip.
TABLE 1 power supply requirement table for MITP system
| Circuit module | Power supply requirement |
| Spartan6 minimum system | 0.75V、1.2V、1.5V、1.8V、3.3V |
| Serial port circuit | 3.3V、5V |
The MITP and the PC realize serial communication by adopting RS232 standard through a serial circuit, and the serial circuit mainly comprises a USB interface and a USB conversion chip CH 340E.
The LED mainly realizes circuit indication and is used for software debugging, and the LED and the software debugging all adopt a common power supply connection mode to obtain higher driving capability.
As shown in fig. 3 and 4, the testing apparatus further includes a software portion, where the software includes a memory monitoring software running in a PC and a memory integration testing software running in the MITP. The memory monitoring software is realized through a first serial port communication module, an information processing module, a UI interaction module, a storage module and a display module.
As shown in fig. 3 and 6, the first serial port communication module mainly implements transceiving of a serial port data frame of the memory integrated test software running in the MITP, sends the received data frame to the information processing module for analysis, and sends the data frame encapsulated by the information processing module to the MITP. In order to realize the function of serial port communication transceiving, four main methods of OpenComm, CloseComm, ReadComm and WriteComm are designed and are respectively used for starting serial port equipment, closing the serial port equipment, reading serial port data and writing the serial port data. In the process of reading serial port data, an RthreadFunc background thread is designed for circularly monitoring and reading data flow.
The information processing module realizes the analysis and encapsulation of the data frame and the arbitration of the control information according to the serial port communication protocol. The method specifically comprises the following steps: the information processing module verifies and analyzes the received data frame, and immediately abandons the current data packet and interrupts the operation when the verification fails; and when the verification is passed, extracting the equipment type, the error code, the running state code and the effective return address in the data frame, and finishing arbitration according to the error code and the running state code. And outputting and displaying the current running state through a display module, and storing running process information into an appointed log file when the test is finished. The information processing module is not only used for analyzing and packaging the serial data frame, but also used for controlling the process when the software runs, so that ITPService classes are designed for maintaining normal operation of the background, wherein the ITPService classes mainly comprise serial control methods such as open Command opening and close closeComm, serial encapsulation methods SendData and the like, and background service control methods such as service Startservice opening and service stop StopService. In order to analyze the serial port data frame, an ITPThreadFunc background thread is designed for verifying the data frame and extracting effective information. And the extracted effective information is sent to a display module and a storage module through messages to be displayed and stored.
The UI interaction module mainly realizes a man-machine interaction function and timely responds to the control requirement of a tester, the storage module completes storage of necessary information and generates log files for subsequent reference, the UI interaction module realizes effective start and stop of a test through a button control, the control button comprises serial port opening and closing buttons, a test starting button, a resetting button and an exiting button, the serial port opening and closing buttons are used for controlling the serial port equipment to be opened and closed, the test starting button is used for starting a background service thread and starting a memory function test, and the resetting button and the exiting button are respectively used for resetting each module of software and safely exiting program operation.
The display module is mainly used for displaying the operation process information in real time through the software display window. The display module runs in the main thread and is mainly used for displaying the state information generated in the storage test process in real time. The method comprises the steps of monitoring a message frame sent by an information processing module in real time through a message receiving function OnMsg (WPARAM wpARAM WPARAM, LPARAM lParam), analyzing the message and outputting the analyzed message to a display window through a designed ShowConsol method, wherein the WPARAM and the LPARAM are message parameters transmitted by the information processing module respectively.
When the memory test is successful or failed, the software will end the background service by the StopService method, and save the message window information msgconsol to the log file named logname by the designed writefile (msgconsol, _ T ("\ \ DataLog \"), logname) function, and the logname naming mode is as follows:
"Fail/Pass _ chip number _ year, month, day, time, txt".
As shown in fig. 4, the memory integration test software is implemented by the second serial port communication module, the clock module, the reset module, the RAM cache module, the logic arbitration module, and the measurement and control module. The second serial port communication module comprises a serial port receiving module, a serial port sending module, a baud rate generating module and a CRC (cyclic redundancy check) module. The second serial port communication module mainly realizes the analysis and encapsulation of data frames, wherein: the serial port receiving module is used for receiving and analyzing data frames, the serial port sending module is used for packaging and sending the data frames, and the serial port receiving module and the serial port sending module both complete data receiving and sending through baud rate pulses generated by the baud rate generating module. In the receiving and sending processes, the serial port receiving module and the serial port sending module respectively adopt a CRC (cyclic redundancy check) module to carry out 16-bit CRC on the data frame, and in the analyzing process of the serial port receiving module, test data sent by the memory monitoring software is cached through an RAM (random access memory) caching module. The measurement and control module comprises a plurality of functional test modules, and each functional test module comprises an FIFO (first in first out) cache module for caching and processing input data of the memory; the logic arbitration module is used for selecting to start the measurement and control module and performing logic arbitration on a data packet sending sequence; the reset module adopts global asynchronous reset; the clock module, the RAM cache module and the FIFO cache module are designed by adopting Xilinx official IP cores.
The reset module adopts the principle of asynchronous reset synchronous release to eliminate burrs introduced by asynchronous reset and synchronizes an external input reset pulse into internal logic through two FFs; and the logic arbitration module selectively starts a corresponding measurement and control module according to the equipment type and the operation code analyzed by the data frame, and controls the transmission sequence of the data packet according to the transmission enabling signal.
The device can realize the full erasing of the memory under the normal temperature environment and the full programming, checking and serial-parallel configuration output function test of various data, and has the full programming, chessboard or March checking function test of the Nand Flash with the JEDEC standard under different working modes.
The external direct-current voltage source is adopted to realize the voltage bias test of the memory and complete the pre-screening, so that the final test yield can be effectively improved.
The distribution of signals at the logic top layer of the FPGA is shown in fig. 5, and the signals mainly include a reset pulse signal FPGA _ RST _ N, an external clock input signal FPGA _ CLK, a Memory interface signal Memory interface, a serial interface signal UART interface, and the like.
According to the invention, FPGA configuration memories such as tests of HWD04S and HWD18V04 and Nand Flash such as tests of HWD29F040 and HWD1603 are carried out, and in view of the compatibility of the instruction sets of HWD04S and HWD18V04, the instruction sets of HWD29F040 and HWD1603 are compatible with each other, the same function test module is respectively adopted, and the test flow is shown in FIGS. 7 and 8. In the self-checking test or the whole-chip test process, if the test fails, the software automatically ends the test process and reports an error message.
In order to be compatible with the HWD1603 and the HWD29F040, in the self-test process, the block erase size is set to 16Kbyte, and the word mode is adopted for programming and verification.
The chessboard algorithm adopts multiple groups of data to carry out alternate programming and verification.
The March algorithm employs a W1- > R1- > (R1- > wd- > rd) - > Rall model, which is selected by the control instruction frame.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalents, improvements, etc. made within the principle of the present invention are included in the scope of the present invention.
Claims (8)
1. A memory test apparatus, the test apparatus comprising: the memory integrated test platform MITP comprises a Spartan6 FPGA minimum system, a power distribution network PDN, a serial port circuit, an LED circuit and a memory test interface circuit, wherein the power distribution network PDN, the serial port circuit, the LED circuit and the memory test interface circuit are in bidirectional communication with the Spartan6 FPGA minimum system respectively; the memory chip to be tested is connected with the MITP through the memory test interface, and the MITP and the PC realize serial port communication through the serial port circuit; the Spartan6 FPGA minimum system is a minimum basic unit which can maintain normal work of the FPGA except a power supply, and comprises a clock circuit, a reset circuit and a configuration circuit, wherein the clock circuit provides a necessary working clock source for the FPGA, the reset circuit provides stable and reliable reset pulse output for the FPGA, and an MAX811 chip is adopted as a reset pulse output chip; the configuration circuit adopts an AS configuration mode and a JTAG boundary scanning interface for Debug debugging and program solidification programming.
2. The memory test device of claim 1, wherein: the PC machine adopts a Windows 7sp 164 bit operating system; the clock circuit comprises two clock sources of 50MHz and 125MHz, and hardware change is reduced by designing an optional reference clock; the configuration circuit employs HWD32P AS an AS configuration chip.
3. The memory test device of claim 2, wherein: the testing device also comprises a software part, wherein the software comprises memory monitoring software running in a PC (personal computer) and memory integration testing software running in the MITP; the memory monitoring software is realized by a first serial port communication module, an information processing module, a UI interaction module, a storage module and a display module; the first serial port communication module mainly realizes the transceiving of the serial port data frame of the memory integrated test software running in the MITP, sends the received data frame to the information processing module for analysis, and sends the data frame packaged by the information processing module to the MITP; the information processing module realizes the analysis and encapsulation of data frames and the arbitration of control information according to a serial port communication protocol, the UI interaction module mainly realizes a man-machine interaction function and timely responds to the control requirements of testers, the storage module finishes the storage of necessary information and generates log files for subsequent reference, and the display module finishes the real-time display of operation process information mainly through a software display window; the memory integration test software is realized through a second serial port communication module, a clock module, a reset module, an RAM cache module, a logic arbitration module and a measurement and control module; the second serial port communication module comprises a serial port receiving module, a serial port sending module, a baud rate generating module and a CRC (cyclic redundancy check) module; the second serial port communication module mainly realizes the analysis and encapsulation of data frames, wherein: the device comprises a serial port receiving module, a serial port sending module, a CRC checking module and a memory monitoring software, wherein the serial port receiving module is used for receiving and analyzing a data frame, the serial port sending module is used for packaging and sending the data frame, the serial port receiving module and the serial port sending module both complete the receiving and sending of data through a baud rate pulse generated by the baud rate generating module, 16-bit CRC checking is carried out on the data frame by adopting the CRC checking module respectively in the receiving and sending processes, and test data issued by the memory monitoring software is cached through the RAM caching module in the analyzing process of the serial port receiving module; the measurement and control module comprises a plurality of functional test modules, and each functional test module comprises an FIFO cache module; the logic arbitration module is used for selecting to start the measurement and control module and performing logic arbitration on a data packet sending sequence; the reset module adopts global asynchronous reset; the clock module, the RAM cache module and the FIFO cache module are designed by adopting Xilinx official IP cores.
4. The memory test device of claim 3, wherein: the arbitration of the information processing module for the control information is specifically as follows: when the verification fails, the current data packet is immediately abandoned and the operation is interrupted, when the verification passes, the equipment type, the error code, the running state code and the effective return address in the data frame are extracted, and the arbitration is completed according to the error code and the running state code; outputting and displaying the current running state through a display module, and storing running process information into a specified log file when the test is finished; the UI interaction module realizes effective start and stop of the test through a button control, the control button comprises serial port opening and closing buttons, a test starting button, a resetting button and an exiting button, the serial port opening and closing buttons are used for controlling the start and the closing of serial port equipment, the test starting button is used for starting a background service thread and starting a memory function test, and the resetting button and the exiting button are respectively used for resetting each module of the software and safely exiting program operation.
5. The memory test device of claim 3, wherein: the information processing module is not only used for analyzing and packaging the serial port data frame, but also used for controlling the process when the software runs.
6. The memory test device of claim 4, wherein: the reset module adopts the principle of asynchronous reset synchronous release to eliminate burrs introduced by asynchronous reset and synchronizes an external input reset pulse into internal logic through two triggers; and the logic arbitration module selectively starts a corresponding measurement and control module according to the equipment type and the operation code analyzed by the data frame, and controls the transmission sequence of the data packet according to the transmission enabling signal.
7. The memory test device of claim 5, wherein the device can realize the full erasing of the FPGA configuration memory under normal temperature environment and the full programming, verification, serial-parallel configuration output function test of various data, and can realize the full programming, chessboard or March verification function test of Nand Flash with JEDEC standard under different working modes.
8. The device for testing the memory according to claim 5, wherein the external DC voltage is used to implement the bias test of the memory voltage and complete the pre-screening, thereby effectively improving the final test yield.
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| CN114116552A (en) * | 2021-10-20 | 2022-03-01 | 中国航空工业集团公司洛阳电光设备研究所 | Data acquisition and transmission device from multi-path Biss-C data to universal serial port |
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